Tooth decay starts when the pH of the mouth is lower than ........

Current GK (MTS) General Science

Tooth decay starts when the pH of the mouth is lower than _______.

This questions was previously asked in

SSC MTS 20th July 2022 Shift-1

5.5

7.5

9.5

10.5

- Option 1: 5.5

- Tooth decay begins when the pH of the mouth falls below 5.5.

- At this pH, the acid produced by bacteria starts to demineralize tooth enamel.

- This is the critical threshold for enamel erosion.

- Option 2: 7.5

- A pH of 7.5 is alkalotic, meaning there’s no risk of tooth decay.

- Above neutral, it’s generally safe for teeth.

- Option 3: 9.5

- This pH is highly alkaline and far beyond typical mouth conditions.

- There’s no risk of decay at this level.

- Option 4: 10.5

- Extremely alkaline, unlikely in the mouth.

- Enamel remains intact without risk of decay.

- Correct Answer: Option 1 - 5.5

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